Energy

SolarCity says it will install solar systems on the roofs of up to 120,000 military homes, with financing coming from Bank of America Merrill Lynch. It's the first time a project of this scale has been launched without the federal government basically co-signing the loan.

As the natural gas industry booms in Pennsylvania, drillers are encountering a hodgepodge of local rules on hydraulic fracturing, or "fracking." State lawmakers are considering changes that would limit the way a local community regulates what happens in its own backyard.

Smart electric meters are being installed in homes across the country. The wireless devices replace old meters and transmit electricity usage data wirelessly to utilities. But there are concerns about accuracy and safety. Guy Raz talks to David Baker, energy reporter at the San Francisco Chronicle, for more.

Windows treated with an insulating film are twice as efficient as regular double-pane windows, since they block heat from entering a building. That's useful on warm days, but inefficient when it's cold. One lab is researching a new coating that could be turned on and off with an electrical current.

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